Most people benefit from 20 to 40 grams of protein after a workout, depending on body size, exercise type, and protein source. That range is enough to maximize the muscle repair process without wasting extra protein your body can’t put to use. But the total amount you eat across the entire day matters more than what you consume in any single post-workout window.
The 20 to 40 Gram Sweet Spot
Your muscles need amino acids to repair the microscopic damage caused by exercise, and about 20 to 25 grams of high-quality protein (from sources like whey, eggs, or meat) is enough to maximize that repair process in a single sitting. Going up to 30 grams can help ensure you hit the threshold of leucine, the specific amino acid that flips the switch from muscle breakdown to muscle building. You need roughly 3 grams of leucine to trigger that shift, and 30 grams of a complete protein source reliably delivers it.
Beyond about 35 grams in one sitting, your muscles already have more building material than they can use. The excess gets redirected to other functions in the body or is eventually excreted. Fast-absorbing proteins like whey are processed at roughly 8 to 10 grams per hour, which means a 30-gram shake takes about three to four hours to fully absorb.
Larger individuals can aim toward the higher end of the range. A practical formula: multiply your body weight in kilograms by 0.55 to find a solid per-meal target. For a 180-pound (82 kg) person, that works out to about 45 grams per meal across four meals a day.
Daily Totals Matter More Than Timing
Sports nutrition experts largely agree that the total daily protein intake is the single most important factor for building and maintaining muscle. The target is 1.6 to 2.2 grams per kilogram of body weight per day. For a 150-pound person, that’s roughly 109 to 150 grams spread across the day. For someone at 200 pounds, the range jumps to about 145 to 200 grams.
People who exercise regularly but aren’t doing heavy strength training can aim a bit lower, around 1.1 to 1.5 grams per kilogram. Those who lift weights consistently or train for endurance events like marathons or cycling races fall in the 1.2 to 1.7 gram range. The upper end of these recommendations is generally reserved for people in a caloric deficit or doing very high training volumes.
The “Anabolic Window” Is Wider Than You Think
The old advice was that you had to slam a protein shake within 45 to 60 minutes of your last set or miss your gains. That idea came from early research and got repeated so often it became gym gospel. The reality is far more forgiving. Your muscles stay in a heightened state of responsiveness to protein for at least 24 hours after resistance exercise, and the elevated repair process can persist for 36 to 48 hours.
This doesn’t mean timing is completely irrelevant. Eating protein within a couple of hours after training is still a reasonable practice, especially if you trained in a fasted state or haven’t eaten in several hours. But stressing over a narrow 60-minute deadline is unnecessary. If you had a meal containing protein an hour or two before your workout, your body is already working with those amino acids during and after your session.
Adjustments for Endurance Exercise
If your workout was primarily cardio (running, cycling, swimming), your recovery needs shift slightly. Endurance athletes benefit from 15 to 30 grams of protein after training, paired with carbohydrates at a 3:1 ratio. So if you eat 20 grams of protein, aim for about 60 grams of carbohydrates alongside it. The carbohydrates replenish glycogen (your muscles’ stored fuel), while the protein handles tissue repair. A chicken sandwich on whole-grain bread with a piece of fruit, for example, hits both targets naturally.
Plant Protein Requires Higher Doses
Not all protein sources trigger the same muscle repair response gram for gram. Plant-based proteins like soy and wheat contain less leucine per gram than animal-based options like whey, eggs, or meat. In controlled studies, 20 grams of whey protein produced a stronger muscle-building response than 20 grams of soy, and even doubling the soy to 40 grams didn’t fully close the gap.
Wheat protein tells a similar story. Researchers found that 35 grams of wheat protein failed to meaningfully stimulate muscle repair in older adults, but increasing the dose to 60 grams (which provided enough leucine to match 35 grams of whey) produced a robust response. If you rely on plant-based protein sources, aiming for the higher end of the range, roughly 40 to 50 grams per meal, helps compensate for the lower leucine content. Blending multiple plant sources (like rice and pea protein) can also improve the amino acid profile.
Practical Post-Workout Options
Hitting 20 to 40 grams of protein doesn’t require supplements, though they can be convenient. Here’s what common foods deliver:
- One scoop of whey protein powder: 20 to 25 grams
- A chicken breast (4 oz): about 35 grams
- Three large eggs: about 18 grams
- One cup of Greek yogurt: 15 to 20 grams
- A can of tuna: about 30 grams
- One cup of cooked lentils: about 18 grams
If a full meal within a couple hours of training fits your schedule, that works just as well as a shake. The best post-workout protein is whichever source you’ll consistently eat as part of a daily intake that hits your total target.